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Finiteness of toric H^1 in a Laurent module

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OAI.MaximalSeshadri.PlaneCech.toric_H1_finite

by wurtle · Nov 4, 2026 · Mathlib 0df444a (Lean v4.33.1)

maximal-seshadrioai-math

With ViV_iVi​ and clearing as above, let A,B,CA,B,CA,B,C be KKK-submodules of MMM stable under coneA, coneB and coneC 0, containing V0,V0,V1V_0,V_0,V_1V0​,V0​,V1​ respectively and generated over those cones by g0,g0,g1g_0,g_0,g_1g0​,g0​,g1​. Then the quotient of cycles A B C (triples in A×B×CA\times B\times CA×B×C summing to zero) by vertexBoundaries A B C V is finite over KKK.

Notation. cycles A B C is the submodule of A×B×CA\times B\times CA×B×C of triples with zero sum.

Formalization Note The statement is verbatim from OpenAI's Lean development, with Definitions files of this development imported in place of the upstream modules; these are supporting code for the statement.

Preamble
import Mathlib
import Definitions.Def_MaximalSeshadriConstants
import Definitions.Def_SeshadriPrelim6

namespace OAI

section

namespace MaximalSeshadri.PlaneCech
noncomputable section
open LaurentPlane
variable {K M : Type*} [Field K] [AddCommGroup M]
  [Module K M]

variable [Module (LaurentPlane.Ring K) M] [IsScalarTower K (LaurentPlane.Ring K) M]

Formal statement
theorem toric_H1_finite (V : Fin 3 → Submodule K M)
    (stable : ∀ i z, z ∈ vertexCone i → ∀ x ∈ V i, T (K := K) z • x ∈ V i)
    {ι : Fin 3 → Type*} [∀ i, Fintype (ι i)] (g : ∀ i, ι i → M)
    (hg : ∀ i a, g i a ∈ V i)
    (clear : ∀ i j (x : M), x ∈ V j →
      ∃ d : ℕ, T (K := K) (d • (weight j-weight i)) • x ∈ V i)
    (A B C : Submodule K M)
    (hA : ∀ z ∈ coneA, ∀ x ∈ A, T (K := K) z • x ∈ A)
    (hB : ∀ z ∈ coneB, ∀ x ∈ B, T (K := K) z • x ∈ B)
    (hC : ∀ z ∈ coneC 0, ∀ x ∈ C, T (K := K) z • x ∈ C)
    (incA : V 0 ≤ A) (incB : V 0 ≤ B) (incC : V 1 ≤ C)
    (genA : A = monomialSpan (K := K) coneA (g 0)) (genB : B = monomialSpan (K := K) coneB (g 0))
    (genC : C = monomialSpan (K := K) (coneC 0) (g 1)) :
    Module.Finite K ((cycles A B C) ⧸ vertexBoundaries A B C V) := by
  sorry

end
end MaximalSeshadri.PlaneCech
end
end OAI
Source
OpenAI, Maximal Seshadri constants on arbitrary polarized surfaces, September 23, 2026, https://github.com/openai/math (paper: preprints/Maximal-Seshadri-Constants-on-Arbitrary-Polarized-Surfaces-September-23-2026/main.pdf; Lean: lean/OAI/AlgebraicGeometry/Seshadri, Apache License 2.0); Lean declaration `OAI.MaximalSeshadri.PlaneCech.toric_H1_finite`, https://github.com/openai/math/blob/adc7f1241b42e322a6451854ab7e4b4c146bf78a/lean/OAI/AlgebraicGeometry/Seshadri/Cohomology/ToricH1.lean#L82

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